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lmkd: Do not downgrade/ignore events when swap is full 

When the swap space is full, a pressure event is unlikely to resolve by
itself.  In this case, do not downgrade or ignore the events.

Bug: 112056451
Test: Fill up swap on a 1GB device and check critical vmpressure events
      are not downgraded.
Change-Id: If154dc364711bf7c86f32e24ddcd10be359386de
This commit is contained in:
Vic Yang 2018-08-07 10:18:22 -07:00
parent 5d707816ac
commit 360a113e9b
1 changed files with 23 additions and 13 deletions
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36
lmkd/lmkd.c
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@ -116,6 +116,7 @@ static bool kill_heaviest_task;
static unsigned long kill_timeout_ms;
static bool use_minfree_levels;
static bool per_app_memcg;
static int swap_free_low_percentage;
/* data required to handle events */
struct event_handler_info {
@ -194,6 +195,7 @@ enum meminfo_field {
MI_BUFFERS,
MI_SHMEM,
MI_UNEVICTABLE,
MI_TOTAL_SWAP,
MI_FREE_SWAP,
MI_DIRTY,
MI_FIELD_COUNT
@ -206,6 +208,7 @@ static const char* const meminfo_field_names[MI_FIELD_COUNT] = {
"Buffers:",
"Shmem:",
"Unevictable:",
"SwapTotal:",
"SwapFree:",
"Dirty:",
};
@ -218,6 +221,7 @@ union meminfo {
int64_t buffers;
int64_t shmem;
int64_t unevictable;
int64_t total_swap;
int64_t free_swap;
int64_t dirty;
/* fields below are calculated rather than read from the file */
@ -1296,20 +1300,24 @@ static void mp_event_common(int data, uint32_t events __unused) {
}
}
// If the pressure is larger than downgrade_pressure lmk will not
// kill any process, since enough memory is available.
if (mem_pressure > downgrade_pressure) {
if (debug_process_killing) {
ALOGI("Ignore %s memory pressure", level_name[level]);
// If we still have enough swap space available, check if we want to
// ignore/downgrade pressure events.
if (mi.field.free_swap >=
mi.field.total_swap * swap_free_low_percentage / 100) {
// If the pressure is larger than downgrade_pressure lmk will not
// kill any process, since enough memory is available.
if (mem_pressure > downgrade_pressure) {
if (debug_process_killing) {
ALOGI("Ignore %s memory pressure", level_name[level]);
}
return;
} else if (level == VMPRESS_LEVEL_CRITICAL && mem_pressure > upgrade_pressure) {
if (debug_process_killing) {
ALOGI("Downgrade critical memory pressure");
}
// Downgrade event, since enough memory available.
level = downgrade_level(level);
}
return;
} else if (level == VMPRESS_LEVEL_CRITICAL &&
mem_pressure > upgrade_pressure) {
if (debug_process_killing) {
ALOGI("Downgrade critical memory pressure");
}
// Downgrade event, since enough memory available.
level = downgrade_level(level);
}
do_kill:
@ -1580,6 +1588,8 @@ int main(int argc __unused, char **argv __unused) {
property_get_bool("ro.lmk.use_minfree_levels", false);
per_app_memcg =
property_get_bool("ro.config.per_app_memcg", low_ram_device);
swap_free_low_percentage =
property_get_int32("ro.lmk.swap_free_low_percentage", 10);
#ifdef LMKD_LOG_STATS
statslog_init(&log_ctx, &enable_stats_log);